Multicylinder hydraulic brake



June 17, 1930. M- LOUGHEAD 1,764,178

MULTICYLINDER HYDRAULIC BRAKE Filed March 17, 1927 2 Sheets-Sheet l @4? 7.11, gywf/M 1 affam J.

June 17, 1930. M. LUGHEAD Y1,764,178

MULTICYLINDER HYDRAULIC BRAKE I l Filed Mach 17, 1927 2 sheets-sheet 2 Patented June l7, 193() UNITED STATES PATENT OFFICE MALCOLM LOUGHEAD, OF DETROIT, EICHIGAN, ASSIGNOR T HYDRAULIC BRAKE COM- PANY, OF LOS ANGELES, CALIFORNIA, A CORPORATION OF CALIFORNIA MULTICYLINDER HYDRAULIC BRAKE appneation med march 17, 1927. serian No. 175,958.

My invention relates to improvements in multicylinder hydraulic brakes, and more particularly to that type of brake inwhich each shoe is provided with hydraulic actuat- 1 5 ing mechanism for the actuation thereof.'`

An object of my invention is to provide a hydraulic brake by means of which I utilize the maximum braking properties of each shoe when the vehicle of which the brakes are a part is moving in one direction, namely forward.

A further object of my invention is to pro- I Fig. 1 is an elevation partially in. section illustrating an embodiment vof the invention. and

Fig. 2 is a sectional view along the line 2 2 of Fig. 1. I

In carrying out the invention I make use of which the brake mechanism is employed. dust pan 2 serves to close the inner end of the `drum 1 and provide confined space for the r brake mechanism. The dust pan 2 is stationary and secured as by rivets 8 to a stationary part of the axle ssembly of the vehicle.

I provide a p ir of 'substantially crescent shaped brake shoes 4, each of which carry brake bands 5 on. the outer surfaces thereof for' engagement with the drum 1.

y The shoes 4 are each pivotally mounted at 6 upon mounting pins 7 which are secured by the provision of nuts 8 disposed uponv threaded portions 9 ofthe pins to the dust pan 2. The pins 7 in the present embodiment are disposed- 180 apart.

Each shoe 4 provided with two tension springs .10 connected to the shoe at one end 11 and to .laterally extending pins 12 onv the dust pan 2 at the opposite end.

Means for limiting the pivoting movement y of the shoes 4 is provided by bolts 13 securedv at 1 4 to the pan 2 and having their laterally pro]ecting portions extending through guide slots 15 provided in the shoes 4.

Each of the shoes 4 has secured at its free l end a brake` shoe operating rodor thrust link 16, the outer end of which engages at 17 with bearing members 21, which bearing mem ers are disposed upon the inner portions of the mounting pins 7 (see Fig. 2),. TheI cylinders,

are thus free to move on their pivotal support, s that there is no strain to this part of "the mechanism when pressure is applied, as

by the application of fluid pressure throughout the exible conduit 22 which communi- Cates at 23 with the interior of thecylinder 19 to force the piston outwardly.

The foot pedal and associate mechanism for exerting fluid pressure withinthe cylinder is fully disclosed and described in my prior Patent No. 1,249,143, issued December 4, 1917. Such mechanism is now Well known yin the'art. 30 the ordinary type of brake drum 1, Whlch is carried vbythe Wheel of the vehicle upon In normal operation the vehicle upon which the brakes are mounted travels vin a forward direction, and the brake drum 1 rotates in that direction indicated by the arrow Assuming now that iuid vpressure is ap-` plied to the cylinders 19 against the piston 18, as described, the pistons 18 would move outwardly to exert longitudinal thrust upon the rods or thrust links 16. r[his causes the .shoes 4 to move upon their pivotal mounting npins 7 against the tension of the springs 10 tation of the drum toward the pivotal mounting of the shoes.

It is a well established fact that the braking power of an internal brake shoe mounted at that end remote from the direction of rotation of the drum is many times that of a similar shoe pivotally mounted at that end adj acent to the directionl of rotation. In the ordinary type of twin shoe internalbrake one of the shoes is always pivotally mounted at that end adjacent to the direction of rotation of the drum. Thus, one shoe possesses many times the braking power of the complementary shoe.

I claim:

1. A vehicle wheel brake comprising a drum, a plurality of brake shoes for engagement with the drum, a fixed pivotal mounting pin for each of said shoes, said shoes being arranged with their pivotally mounted end adjacent to the free end of the adjacent shoe and motors having relatively stationary parts pivotally mounted upon the fixed pivotal mounting pins and having movable driven movable parts connected with the free end of the adjacent shoe.

2. In an internal brake mechanism, a brake drum, pivotally mounted shoes arranged for engagement with the brake drum, each shoe having its pivoted end remote from kthe normal direction of rotation of said drum, and fluid motors for moving the shoes into engagement with said drumfeachymotor pivotally supported upon the pivotal mounting of a shoe and operatively connected with the free end of the adjacent shoe.

In witness whereof, I hereunto subscribe my name this 11th day of March, 1927.

MALCOLM LOUGHEAD'. 

